diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/hid/intel-ish-hid/ipc/ipc.c | 979 |
1 files changed, 979 insertions, 0 deletions
diff --git a/drivers/hid/intel-ish-hid/ipc/ipc.c b/drivers/hid/intel-ish-hid/ipc/ipc.c new file mode 100644 index 000000000..e00b9dbe2 --- /dev/null +++ b/drivers/hid/intel-ish-hid/ipc/ipc.c @@ -0,0 +1,979 @@ +/* + * H/W layer of ISHTP provider device (ISH) + * + * Copyright (c) 2014-2016, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <linux/sched.h> +#include <linux/spinlock.h> +#include <linux/delay.h> +#include <linux/jiffies.h> +#include "client.h" +#include "hw-ish.h" +#include "hbm.h" + +/* For FW reset flow */ +static struct work_struct fw_reset_work; +static struct ishtp_device *ishtp_dev; + +/** + * ish_reg_read() - Read register + * @dev: ISHTP device pointer + * @offset: Register offset + * + * Read 32 bit register at a given offset + * + * Return: Read register value + */ +static inline uint32_t ish_reg_read(const struct ishtp_device *dev, + unsigned long offset) +{ + struct ish_hw *hw = to_ish_hw(dev); + + return readl(hw->mem_addr + offset); +} + +/** + * ish_reg_write() - Write register + * @dev: ISHTP device pointer + * @offset: Register offset + * @value: Value to write + * + * Writes 32 bit register at a give offset + */ +static inline void ish_reg_write(struct ishtp_device *dev, + unsigned long offset, + uint32_t value) +{ + struct ish_hw *hw = to_ish_hw(dev); + + writel(value, hw->mem_addr + offset); +} + +/** + * _ish_read_fw_sts_reg() - Read FW status register + * @dev: ISHTP device pointer + * + * Read FW status register + * + * Return: Read register value + */ +static inline uint32_t _ish_read_fw_sts_reg(struct ishtp_device *dev) +{ + return ish_reg_read(dev, IPC_REG_ISH_HOST_FWSTS); +} + +/** + * check_generated_interrupt() - Check if ISH interrupt + * @dev: ISHTP device pointer + * + * Check if an interrupt was generated for ISH + * + * Return: Read true or false + */ +static bool check_generated_interrupt(struct ishtp_device *dev) +{ + bool interrupt_generated = true; + uint32_t pisr_val = 0; + + if (dev->pdev->device == CHV_DEVICE_ID) { + pisr_val = ish_reg_read(dev, IPC_REG_PISR_CHV_AB); + interrupt_generated = + IPC_INT_FROM_ISH_TO_HOST_CHV_AB(pisr_val); + } else { + pisr_val = ish_reg_read(dev, IPC_REG_PISR_BXT); + interrupt_generated = !!pisr_val; + /* only busy-clear bit is RW, others are RO */ + if (pisr_val) + ish_reg_write(dev, IPC_REG_PISR_BXT, pisr_val); + } + + return interrupt_generated; +} + +/** + * ish_is_input_ready() - Check if FW ready for RX + * @dev: ISHTP device pointer + * + * Check if ISH FW is ready for receiving data + * + * Return: Read true or false + */ +static bool ish_is_input_ready(struct ishtp_device *dev) +{ + uint32_t doorbell_val; + + doorbell_val = ish_reg_read(dev, IPC_REG_HOST2ISH_DRBL); + return !IPC_IS_BUSY(doorbell_val); +} + +/** + * set_host_ready() - Indicate host ready + * @dev: ISHTP device pointer + * + * Set host ready indication to FW + */ +static void set_host_ready(struct ishtp_device *dev) +{ + if (dev->pdev->device == CHV_DEVICE_ID) { + if (dev->pdev->revision == REVISION_ID_CHT_A0 || + (dev->pdev->revision & REVISION_ID_SI_MASK) == + REVISION_ID_CHT_Ax_SI) + ish_reg_write(dev, IPC_REG_HOST_COMM, 0x81); + else if (dev->pdev->revision == REVISION_ID_CHT_B0 || + (dev->pdev->revision & REVISION_ID_SI_MASK) == + REVISION_ID_CHT_Bx_SI || + (dev->pdev->revision & REVISION_ID_SI_MASK) == + REVISION_ID_CHT_Kx_SI || + (dev->pdev->revision & REVISION_ID_SI_MASK) == + REVISION_ID_CHT_Dx_SI) { + uint32_t host_comm_val; + + host_comm_val = ish_reg_read(dev, IPC_REG_HOST_COMM); + host_comm_val |= IPC_HOSTCOMM_INT_EN_BIT_CHV_AB | 0x81; + ish_reg_write(dev, IPC_REG_HOST_COMM, host_comm_val); + } + } else { + uint32_t host_pimr_val; + + host_pimr_val = ish_reg_read(dev, IPC_REG_PIMR_BXT); + host_pimr_val |= IPC_PIMR_INT_EN_BIT_BXT; + /* + * disable interrupt generated instead of + * RX_complete_msg + */ + host_pimr_val &= ~IPC_HOST2ISH_BUSYCLEAR_MASK_BIT; + + ish_reg_write(dev, IPC_REG_PIMR_BXT, host_pimr_val); + } +} + +/** + * ishtp_fw_is_ready() - Check if FW ready + * @dev: ISHTP device pointer + * + * Check if ISH FW is ready + * + * Return: Read true or false + */ +static bool ishtp_fw_is_ready(struct ishtp_device *dev) +{ + uint32_t ish_status = _ish_read_fw_sts_reg(dev); + + return IPC_IS_ISH_ILUP(ish_status) && + IPC_IS_ISH_ISHTP_READY(ish_status); +} + +/** + * ish_set_host_rdy() - Indicate host ready + * @dev: ISHTP device pointer + * + * Set host ready indication to FW + */ +static void ish_set_host_rdy(struct ishtp_device *dev) +{ + uint32_t host_status = ish_reg_read(dev, IPC_REG_HOST_COMM); + + IPC_SET_HOST_READY(host_status); + ish_reg_write(dev, IPC_REG_HOST_COMM, host_status); +} + +/** + * ish_clr_host_rdy() - Indicate host not ready + * @dev: ISHTP device pointer + * + * Send host not ready indication to FW + */ +static void ish_clr_host_rdy(struct ishtp_device *dev) +{ + uint32_t host_status = ish_reg_read(dev, IPC_REG_HOST_COMM); + + IPC_CLEAR_HOST_READY(host_status); + ish_reg_write(dev, IPC_REG_HOST_COMM, host_status); +} + +/** + * _ishtp_read_hdr() - Read message header + * @dev: ISHTP device pointer + * + * Read header of 32bit length + * + * Return: Read register value + */ +static uint32_t _ishtp_read_hdr(const struct ishtp_device *dev) +{ + return ish_reg_read(dev, IPC_REG_ISH2HOST_MSG); +} + +/** + * _ishtp_read - Read message + * @dev: ISHTP device pointer + * @buffer: message buffer + * @buffer_length: length of message buffer + * + * Read message from FW + * + * Return: Always 0 + */ +static int _ishtp_read(struct ishtp_device *dev, unsigned char *buffer, + unsigned long buffer_length) +{ + uint32_t i; + uint32_t *r_buf = (uint32_t *)buffer; + uint32_t msg_offs; + + msg_offs = IPC_REG_ISH2HOST_MSG + sizeof(struct ishtp_msg_hdr); + for (i = 0; i < buffer_length; i += sizeof(uint32_t)) + *r_buf++ = ish_reg_read(dev, msg_offs + i); + + return 0; +} + +/** + * write_ipc_from_queue() - try to write ipc msg from Tx queue to device + * @dev: ishtp device pointer + * + * Check if DRBL is cleared. if it is - write the first IPC msg, then call + * the callback function (unless it's NULL) + * + * Return: 0 for success else failure code + */ +static int write_ipc_from_queue(struct ishtp_device *dev) +{ + struct wr_msg_ctl_info *ipc_link; + unsigned long length; + unsigned long rem; + unsigned long flags; + uint32_t doorbell_val; + uint32_t *r_buf; + uint32_t reg_addr; + int i; + void (*ipc_send_compl)(void *); + void *ipc_send_compl_prm; + static int out_ipc_locked; + unsigned long out_ipc_flags; + + if (dev->dev_state == ISHTP_DEV_DISABLED) + return -EINVAL; + + spin_lock_irqsave(&dev->out_ipc_spinlock, out_ipc_flags); + if (out_ipc_locked) { + spin_unlock_irqrestore(&dev->out_ipc_spinlock, out_ipc_flags); + return -EBUSY; + } + out_ipc_locked = 1; + if (!ish_is_input_ready(dev)) { + out_ipc_locked = 0; + spin_unlock_irqrestore(&dev->out_ipc_spinlock, out_ipc_flags); + return -EBUSY; + } + spin_unlock_irqrestore(&dev->out_ipc_spinlock, out_ipc_flags); + + spin_lock_irqsave(&dev->wr_processing_spinlock, flags); + /* + * if tx send list is empty - return 0; + * may happen, as RX_COMPLETE handler doesn't check list emptiness. + */ + if (list_empty(&dev->wr_processing_list_head.link)) { + spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags); + out_ipc_locked = 0; + return 0; + } + + ipc_link = list_entry(dev->wr_processing_list_head.link.next, + struct wr_msg_ctl_info, link); + /* first 4 bytes of the data is the doorbell value (IPC header) */ + length = ipc_link->length - sizeof(uint32_t); + doorbell_val = *(uint32_t *)ipc_link->inline_data; + r_buf = (uint32_t *)(ipc_link->inline_data + sizeof(uint32_t)); + + /* If sending MNG_SYNC_FW_CLOCK, update clock again */ + if (IPC_HEADER_GET_PROTOCOL(doorbell_val) == IPC_PROTOCOL_MNG && + IPC_HEADER_GET_MNG_CMD(doorbell_val) == MNG_SYNC_FW_CLOCK) { + uint64_t usec_system, usec_utc; + struct ipc_time_update_msg time_update; + struct time_sync_format ts_format; + + usec_system = ktime_to_us(ktime_get_boottime()); + usec_utc = ktime_to_us(ktime_get_real()); + ts_format.ts1_source = HOST_SYSTEM_TIME_USEC; + ts_format.ts2_source = HOST_UTC_TIME_USEC; + ts_format.reserved = 0; + + time_update.primary_host_time = usec_system; + time_update.secondary_host_time = usec_utc; + time_update.sync_info = ts_format; + + memcpy(r_buf, &time_update, + sizeof(struct ipc_time_update_msg)); + } + + for (i = 0, reg_addr = IPC_REG_HOST2ISH_MSG; i < length >> 2; i++, + reg_addr += 4) + ish_reg_write(dev, reg_addr, r_buf[i]); + + rem = length & 0x3; + if (rem > 0) { + uint32_t reg = 0; + + memcpy(®, &r_buf[length >> 2], rem); + ish_reg_write(dev, reg_addr, reg); + } + /* Flush writes to msg registers and doorbell */ + ish_reg_read(dev, IPC_REG_ISH_HOST_FWSTS); + + /* Update IPC counters */ + ++dev->ipc_tx_cnt; + dev->ipc_tx_bytes_cnt += IPC_HEADER_GET_LENGTH(doorbell_val); + + ish_reg_write(dev, IPC_REG_HOST2ISH_DRBL, doorbell_val); + out_ipc_locked = 0; + + ipc_send_compl = ipc_link->ipc_send_compl; + ipc_send_compl_prm = ipc_link->ipc_send_compl_prm; + list_del_init(&ipc_link->link); + list_add_tail(&ipc_link->link, &dev->wr_free_list_head.link); + spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags); + + /* + * callback will be called out of spinlock, + * after ipc_link returned to free list + */ + if (ipc_send_compl) + ipc_send_compl(ipc_send_compl_prm); + + return 0; +} + +/** + * write_ipc_to_queue() - write ipc msg to Tx queue + * @dev: ishtp device instance + * @ipc_send_compl: Send complete callback + * @ipc_send_compl_prm: Parameter to send in complete callback + * @msg: Pointer to message + * @length: Length of message + * + * Recived msg with IPC (and upper protocol) header and add it to the device + * Tx-to-write list then try to send the first IPC waiting msg + * (if DRBL is cleared) + * This function returns negative value for failure (means free list + * is empty, or msg too long) and 0 for success. + * + * Return: 0 for success else failure code + */ +static int write_ipc_to_queue(struct ishtp_device *dev, + void (*ipc_send_compl)(void *), void *ipc_send_compl_prm, + unsigned char *msg, int length) +{ + struct wr_msg_ctl_info *ipc_link; + unsigned long flags; + + if (length > IPC_FULL_MSG_SIZE) + return -EMSGSIZE; + + spin_lock_irqsave(&dev->wr_processing_spinlock, flags); + if (list_empty(&dev->wr_free_list_head.link)) { + spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags); + return -ENOMEM; + } + ipc_link = list_entry(dev->wr_free_list_head.link.next, + struct wr_msg_ctl_info, link); + list_del_init(&ipc_link->link); + + ipc_link->ipc_send_compl = ipc_send_compl; + ipc_link->ipc_send_compl_prm = ipc_send_compl_prm; + ipc_link->length = length; + memcpy(ipc_link->inline_data, msg, length); + + list_add_tail(&ipc_link->link, &dev->wr_processing_list_head.link); + spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags); + + write_ipc_from_queue(dev); + + return 0; +} + +/** + * ipc_send_mng_msg() - Send management message + * @dev: ishtp device instance + * @msg_code: Message code + * @msg: Pointer to message + * @size: Length of message + * + * Send management message to FW + * + * Return: 0 for success else failure code + */ +static int ipc_send_mng_msg(struct ishtp_device *dev, uint32_t msg_code, + void *msg, size_t size) +{ + unsigned char ipc_msg[IPC_FULL_MSG_SIZE]; + uint32_t drbl_val = IPC_BUILD_MNG_MSG(msg_code, size); + + memcpy(ipc_msg, &drbl_val, sizeof(uint32_t)); + memcpy(ipc_msg + sizeof(uint32_t), msg, size); + return write_ipc_to_queue(dev, NULL, NULL, ipc_msg, + sizeof(uint32_t) + size); +} + +#define WAIT_FOR_FW_RDY 0x1 +#define WAIT_FOR_INPUT_RDY 0x2 + +/** + * timed_wait_for_timeout() - wait special event with timeout + * @dev: ISHTP device pointer + * @condition: indicate the condition for waiting + * @timeinc: time slice for every wait cycle, in ms + * @timeout: time in ms for timeout + * + * This function will check special event to be ready in a loop, the loop + * period is specificd in timeinc. Wait timeout will causes failure. + * + * Return: 0 for success else failure code + */ +static int timed_wait_for_timeout(struct ishtp_device *dev, int condition, + unsigned int timeinc, unsigned int timeout) +{ + bool complete = false; + int ret; + + do { + if (condition == WAIT_FOR_FW_RDY) { + complete = ishtp_fw_is_ready(dev); + } else if (condition == WAIT_FOR_INPUT_RDY) { + complete = ish_is_input_ready(dev); + } else { + ret = -EINVAL; + goto out; + } + + if (!complete) { + unsigned long left_time; + + left_time = msleep_interruptible(timeinc); + timeout -= (timeinc - left_time); + } + } while (!complete && timeout > 0); + + if (complete) + ret = 0; + else + ret = -EBUSY; + +out: + return ret; +} + +#define TIME_SLICE_FOR_FW_RDY_MS 100 +#define TIME_SLICE_FOR_INPUT_RDY_MS 100 +#define TIMEOUT_FOR_FW_RDY_MS 2000 +#define TIMEOUT_FOR_INPUT_RDY_MS 2000 + +/** + * ish_fw_reset_handler() - FW reset handler + * @dev: ishtp device pointer + * + * Handle FW reset + * + * Return: 0 for success else failure code + */ +static int ish_fw_reset_handler(struct ishtp_device *dev) +{ + uint32_t reset_id; + unsigned long flags; + struct wr_msg_ctl_info *processing, *next; + + /* Read reset ID */ + reset_id = ish_reg_read(dev, IPC_REG_ISH2HOST_MSG) & 0xFFFF; + + /* Clear IPC output queue */ + spin_lock_irqsave(&dev->wr_processing_spinlock, flags); + list_for_each_entry_safe(processing, next, + &dev->wr_processing_list_head.link, link) { + list_move_tail(&processing->link, &dev->wr_free_list_head.link); + } + spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags); + + /* ISHTP notification in IPC_RESET */ + ishtp_reset_handler(dev); + + if (!ish_is_input_ready(dev)) + timed_wait_for_timeout(dev, WAIT_FOR_INPUT_RDY, + TIME_SLICE_FOR_INPUT_RDY_MS, TIMEOUT_FOR_INPUT_RDY_MS); + + /* ISH FW is dead */ + if (!ish_is_input_ready(dev)) + return -EPIPE; + /* + * Set HOST2ISH.ILUP. Apparently we need this BEFORE sending + * RESET_NOTIFY_ACK - FW will be checking for it + */ + ish_set_host_rdy(dev); + /* Send RESET_NOTIFY_ACK (with reset_id) */ + ipc_send_mng_msg(dev, MNG_RESET_NOTIFY_ACK, &reset_id, + sizeof(uint32_t)); + + /* Wait for ISH FW'es ILUP and ISHTP_READY */ + timed_wait_for_timeout(dev, WAIT_FOR_FW_RDY, + TIME_SLICE_FOR_FW_RDY_MS, TIMEOUT_FOR_FW_RDY_MS); + if (!ishtp_fw_is_ready(dev)) { + /* ISH FW is dead */ + uint32_t ish_status; + + ish_status = _ish_read_fw_sts_reg(dev); + dev_err(dev->devc, + "[ishtp-ish]: completed reset, ISH is dead (FWSTS = %08X)\n", + ish_status); + return -ENODEV; + } + return 0; +} + +#define TIMEOUT_FOR_HW_RDY_MS 300 + +/** + * ish_fw_reset_work_fn() - FW reset worker function + * @unused: not used + * + * Call ish_fw_reset_handler to complete FW reset + */ +static void fw_reset_work_fn(struct work_struct *unused) +{ + int rv; + + rv = ish_fw_reset_handler(ishtp_dev); + if (!rv) { + /* ISH is ILUP & ISHTP-ready. Restart ISHTP */ + msleep_interruptible(TIMEOUT_FOR_HW_RDY_MS); + ishtp_dev->recvd_hw_ready = 1; + wake_up_interruptible(&ishtp_dev->wait_hw_ready); + + /* ISHTP notification in IPC_RESET sequence completion */ + ishtp_reset_compl_handler(ishtp_dev); + } else + dev_err(ishtp_dev->devc, "[ishtp-ish]: FW reset failed (%d)\n", + rv); +} + +/** + * _ish_sync_fw_clock() -Sync FW clock with the OS clock + * @dev: ishtp device pointer + * + * Sync FW and OS time + */ +static void _ish_sync_fw_clock(struct ishtp_device *dev) +{ + static unsigned long prev_sync; + uint64_t usec; + + if (prev_sync && jiffies - prev_sync < 20 * HZ) + return; + + prev_sync = jiffies; + usec = ktime_to_us(ktime_get_boottime()); + ipc_send_mng_msg(dev, MNG_SYNC_FW_CLOCK, &usec, sizeof(uint64_t)); +} + +/** + * recv_ipc() - Receive and process IPC management messages + * @dev: ishtp device instance + * @doorbell_val: doorbell value + * + * This function runs in ISR context. + * NOTE: Any other mng command than reset_notify and reset_notify_ack + * won't wake BH handler + */ +static void recv_ipc(struct ishtp_device *dev, uint32_t doorbell_val) +{ + uint32_t mng_cmd; + + mng_cmd = IPC_HEADER_GET_MNG_CMD(doorbell_val); + + switch (mng_cmd) { + default: + break; + + case MNG_RX_CMPL_INDICATION: + if (dev->suspend_flag) { + dev->suspend_flag = 0; + wake_up_interruptible(&dev->suspend_wait); + } + if (dev->resume_flag) { + dev->resume_flag = 0; + wake_up_interruptible(&dev->resume_wait); + } + + write_ipc_from_queue(dev); + break; + + case MNG_RESET_NOTIFY: + if (!ishtp_dev) { + ishtp_dev = dev; + INIT_WORK(&fw_reset_work, fw_reset_work_fn); + } + schedule_work(&fw_reset_work); + break; + + case MNG_RESET_NOTIFY_ACK: + dev->recvd_hw_ready = 1; + wake_up_interruptible(&dev->wait_hw_ready); + break; + } +} + +/** + * ish_irq_handler() - ISH IRQ handler + * @irq: irq number + * @dev_id: ishtp device pointer + * + * ISH IRQ handler. If interrupt is generated and is for ISH it will process + * the interrupt. + */ +irqreturn_t ish_irq_handler(int irq, void *dev_id) +{ + struct ishtp_device *dev = dev_id; + uint32_t doorbell_val; + bool interrupt_generated; + + /* Check that it's interrupt from ISH (may be shared) */ + interrupt_generated = check_generated_interrupt(dev); + + if (!interrupt_generated) + return IRQ_NONE; + + doorbell_val = ish_reg_read(dev, IPC_REG_ISH2HOST_DRBL); + if (!IPC_IS_BUSY(doorbell_val)) + return IRQ_HANDLED; + + if (dev->dev_state == ISHTP_DEV_DISABLED) + return IRQ_HANDLED; + + /* Sanity check: IPC dgram length in header */ + if (IPC_HEADER_GET_LENGTH(doorbell_val) > IPC_PAYLOAD_SIZE) { + dev_err(dev->devc, + "IPC hdr - bad length: %u; dropped\n", + (unsigned int)IPC_HEADER_GET_LENGTH(doorbell_val)); + goto eoi; + } + + switch (IPC_HEADER_GET_PROTOCOL(doorbell_val)) { + default: + break; + case IPC_PROTOCOL_MNG: + recv_ipc(dev, doorbell_val); + break; + case IPC_PROTOCOL_ISHTP: + ishtp_recv(dev); + break; + } + +eoi: + /* Update IPC counters */ + ++dev->ipc_rx_cnt; + dev->ipc_rx_bytes_cnt += IPC_HEADER_GET_LENGTH(doorbell_val); + + ish_reg_write(dev, IPC_REG_ISH2HOST_DRBL, 0); + /* Flush write to doorbell */ + ish_reg_read(dev, IPC_REG_ISH_HOST_FWSTS); + + return IRQ_HANDLED; +} + +/** + * ish_disable_dma() - disable dma communication between host and ISHFW + * @dev: ishtp device pointer + * + * Clear the dma enable bit and wait for dma inactive. + * + * Return: 0 for success else error code. + */ +static int ish_disable_dma(struct ishtp_device *dev) +{ + unsigned int dma_delay; + + /* Clear the dma enable bit */ + ish_reg_write(dev, IPC_REG_ISH_RMP2, 0); + + /* wait for dma inactive */ + for (dma_delay = 0; dma_delay < MAX_DMA_DELAY && + _ish_read_fw_sts_reg(dev) & (IPC_ISH_IN_DMA); + dma_delay += 5) + mdelay(5); + + if (dma_delay >= MAX_DMA_DELAY) { + dev_err(dev->devc, + "Wait for DMA inactive timeout\n"); + return -EBUSY; + } + + return 0; +} + +/** + * ish_wakeup() - wakeup ishfw from waiting-for-host state + * @dev: ishtp device pointer + * + * Set the dma enable bit and send a void message to FW, + * it wil wakeup FW from waiting-for-host state. + */ +static void ish_wakeup(struct ishtp_device *dev) +{ + /* Set dma enable bit */ + ish_reg_write(dev, IPC_REG_ISH_RMP2, IPC_RMP2_DMA_ENABLED); + + /* + * Send 0 IPC message so that ISH FW wakes up if it was already + * asleep. + */ + ish_reg_write(dev, IPC_REG_HOST2ISH_DRBL, IPC_DRBL_BUSY_BIT); + + /* Flush writes to doorbell and REMAP2 */ + ish_reg_read(dev, IPC_REG_ISH_HOST_FWSTS); +} + +/** + * _ish_hw_reset() - HW reset + * @dev: ishtp device pointer + * + * Reset ISH HW to recover if any error + * + * Return: 0 for success else error fault code + */ +static int _ish_hw_reset(struct ishtp_device *dev) +{ + struct pci_dev *pdev = dev->pdev; + int rv; + uint16_t csr; + + if (!pdev) + return -ENODEV; + + rv = pci_reset_function(pdev); + if (!rv) + dev->dev_state = ISHTP_DEV_RESETTING; + + if (!pdev->pm_cap) { + dev_err(&pdev->dev, "Can't reset - no PM caps\n"); + return -EINVAL; + } + + /* Disable dma communication between FW and host */ + if (ish_disable_dma(dev)) { + dev_err(&pdev->dev, + "Can't reset - stuck with DMA in-progress\n"); + return -EBUSY; + } + + pci_read_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, &csr); + + csr &= ~PCI_PM_CTRL_STATE_MASK; + csr |= PCI_D3hot; + pci_write_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, csr); + + mdelay(pdev->d3_delay); + + csr &= ~PCI_PM_CTRL_STATE_MASK; + csr |= PCI_D0; + pci_write_config_word(pdev, pdev->pm_cap + PCI_PM_CTRL, csr); + + /* Now we can enable ISH DMA operation and wakeup ISHFW */ + ish_wakeup(dev); + + return 0; +} + +/** + * _ish_ipc_reset() - IPC reset + * @dev: ishtp device pointer + * + * Resets host and fw IPC and upper layers + * + * Return: 0 for success else error fault code + */ +static int _ish_ipc_reset(struct ishtp_device *dev) +{ + struct ipc_rst_payload_type ipc_mng_msg; + int rv = 0; + + ipc_mng_msg.reset_id = 1; + ipc_mng_msg.reserved = 0; + + set_host_ready(dev); + + /* Clear the incoming doorbell */ + ish_reg_write(dev, IPC_REG_ISH2HOST_DRBL, 0); + /* Flush write to doorbell */ + ish_reg_read(dev, IPC_REG_ISH_HOST_FWSTS); + + dev->recvd_hw_ready = 0; + + /* send message */ + rv = ipc_send_mng_msg(dev, MNG_RESET_NOTIFY, &ipc_mng_msg, + sizeof(struct ipc_rst_payload_type)); + if (rv) { + dev_err(dev->devc, "Failed to send IPC MNG_RESET_NOTIFY\n"); + return rv; + } + + wait_event_interruptible_timeout(dev->wait_hw_ready, + dev->recvd_hw_ready, 2 * HZ); + if (!dev->recvd_hw_ready) { + dev_err(dev->devc, "Timed out waiting for HW ready\n"); + rv = -ENODEV; + } + + return rv; +} + +/** + * ish_hw_start() -Start ISH HW + * @dev: ishtp device pointer + * + * Set host to ready state and wait for FW reset + * + * Return: 0 for success else error fault code + */ +int ish_hw_start(struct ishtp_device *dev) +{ + ish_set_host_rdy(dev); + + set_host_ready(dev); + + /* After that we can enable ISH DMA operation and wakeup ISHFW */ + ish_wakeup(dev); + + /* wait for FW-initiated reset flow */ + if (!dev->recvd_hw_ready) + wait_event_interruptible_timeout(dev->wait_hw_ready, + dev->recvd_hw_ready, + 10 * HZ); + + if (!dev->recvd_hw_ready) { + dev_err(dev->devc, + "[ishtp-ish]: Timed out waiting for FW-initiated reset\n"); + return -ENODEV; + } + + return 0; +} + +/** + * ish_ipc_get_header() -Get doorbell value + * @dev: ishtp device pointer + * @length: length of message + * @busy: busy status + * + * Get door bell value from message header + * + * Return: door bell value + */ +static uint32_t ish_ipc_get_header(struct ishtp_device *dev, int length, + int busy) +{ + uint32_t drbl_val; + + drbl_val = IPC_BUILD_HEADER(length, IPC_PROTOCOL_ISHTP, busy); + + return drbl_val; +} + +static const struct ishtp_hw_ops ish_hw_ops = { + .hw_reset = _ish_hw_reset, + .ipc_reset = _ish_ipc_reset, + .ipc_get_header = ish_ipc_get_header, + .ishtp_read = _ishtp_read, + .write = write_ipc_to_queue, + .get_fw_status = _ish_read_fw_sts_reg, + .sync_fw_clock = _ish_sync_fw_clock, + .ishtp_read_hdr = _ishtp_read_hdr +}; + +/** + * ish_dev_init() -Initialize ISH devoce + * @pdev: PCI device + * + * Allocate ISHTP device and initialize IPC processing + * + * Return: ISHTP device instance on success else NULL + */ +struct ishtp_device *ish_dev_init(struct pci_dev *pdev) +{ + struct ishtp_device *dev; + int i; + + dev = devm_kzalloc(&pdev->dev, + sizeof(struct ishtp_device) + sizeof(struct ish_hw), + GFP_KERNEL); + if (!dev) + return NULL; + + ishtp_device_init(dev); + + init_waitqueue_head(&dev->wait_hw_ready); + + spin_lock_init(&dev->wr_processing_spinlock); + spin_lock_init(&dev->out_ipc_spinlock); + + /* Init IPC processing and free lists */ + INIT_LIST_HEAD(&dev->wr_processing_list_head.link); + INIT_LIST_HEAD(&dev->wr_free_list_head.link); + for (i = 0; i < IPC_TX_FIFO_SIZE; ++i) { + struct wr_msg_ctl_info *tx_buf; + + tx_buf = devm_kzalloc(&pdev->dev, + sizeof(struct wr_msg_ctl_info), + GFP_KERNEL); + if (!tx_buf) { + /* + * IPC buffers may be limited or not available + * at all - although this shouldn't happen + */ + dev_err(dev->devc, + "[ishtp-ish]: failure in Tx FIFO allocations (%d)\n", + i); + break; + } + list_add_tail(&tx_buf->link, &dev->wr_free_list_head.link); + } + + dev->ops = &ish_hw_ops; + dev->devc = &pdev->dev; + dev->mtu = IPC_PAYLOAD_SIZE - sizeof(struct ishtp_msg_hdr); + return dev; +} + +/** + * ish_device_disable() - Disable ISH device + * @dev: ISHTP device pointer + * + * Disable ISH by clearing host ready to inform firmware. + */ +void ish_device_disable(struct ishtp_device *dev) +{ + struct pci_dev *pdev = dev->pdev; + + if (!pdev) + return; + + /* Disable dma communication between FW and host */ + if (ish_disable_dma(dev)) { + dev_err(&pdev->dev, + "Can't reset - stuck with DMA in-progress\n"); + return; + } + + /* Put ISH to D3hot state for power saving */ + pci_set_power_state(pdev, PCI_D3hot); + + dev->dev_state = ISHTP_DEV_DISABLED; + ish_clr_host_rdy(dev); +} |